JP6920446B2 - Optical receiver - Google Patents

Description

The present application relates to the field of optical communication, and more particularly to an optical receiver having a high frequency peak gain.

The 10G Passive Optical Network (PON) technology and products are ready and will enter the large-scale deployment phase. In 10G PON, the cost of optical network unit (Optical Network Unit, ONU) becomes an important issue for future large-scale deployment, and cost reduction is an important requirement of 10G PON. Bi-directional Optical Sub-Assembly On Board (BOB) technology, which is widely used within Gigabit Passive Optical Network (GPON), is also 10G to reduce packaging costs. Can be used within PON. Therefore, component cost reduction is important for further cost reduction.

In a 10G PON ONU, a 10G avalanche photodiode (APD) is the fastest optical component and reflects the most costly part. Therefore, reducing the cost of APD is important for reducing the cost of 10G PON ONUs.

Embodiments of the present application provide an optical receiver for receiving high speed signals by using a low speed APD, thereby solving the problem that the cost of the entire component is excessively high due to the excessively high cost of the high speed APD. do.

According to the first aspect, an optical receiver including an optical electron detector, a transimpedance amplification circuit, a single-ended-differential converter, an I / O interface, and a controller is provided, and the optical electron detector is an optical signal received. The optical electron detector bandwidth is lower than the system transmission bandwidth requirement, and the transimpedance amplification circuit receives the current signal and the first control signal to obtain the voltage signal. Is configured to perform a transimpedance gain on the current signal based on the first control signal, the frequency response of the current signal within the first bandwidth is higher than that within the bandwidth of the photoelectron detector. Large, any frequency within the first bandwidth is above the high frequency cutoff frequency of the optoelectronic detector, and the single-ended-differential converter converts the voltage signal into a differential voltage signal, converting the differential voltage signal. It is configured to send to the I / O interface and controller, the I / O interface is configured to output a differential voltage signal, and the controller generates a second control signal based on the differential voltage signal. It is configured to send a second control signal to the transimpedance amplification circuit, which is used to control the transimpedance amplification circuit to perform a transimpedance gain on the current signal.

According to the optical receiver provided in this embodiment of the present application, an optical electron detector whose bandwidth is lower than the system transmission bandwidth requirement is used to significantly reduce the cost of the optical receiver and is a transimpedance amplifier circuit. Is used to repair the degradation of the received signal caused by lack of bandwidth, thus ensuring the quality of the received signal while reducing component costs.

Referring to the first aspect, in the first possible implementation of the first aspect, the controller specifically performs a plurality of sampling processes, and in each sampling process, the following process, that is, transimpedance of the control signal is performed. Sending to an amplifier circuit, sampling the upper and lower levels of the received differential voltage signal to obtain sampling point values, and modifying the control signal based on a preset amount of modification. After being configured to perform and performing multiple sampling processes, the controller in particular receives a control signal corresponding to the sampling point having the highest value among the multiple sampling points obtained after the multiple sampling processes. It is configured to be used as a second control signal.

Referring to the first aspect, in the second possible implementation of the first aspect, the controller specifically performs a plurality of detection processes, each of which transimpedes the following process, i.e., the control signal. Sending to an amplifier circuit, using the first frequency as a boundary, separate the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency in order to obtain the energy difference. The first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal, and the control signal is modified based on the preset amount of modification. After performing multiple detection processes, the controller specifically sends a control signal corresponding to the smallest energy difference among the multiple energy differences obtained after the multiple detection processes. , Is configured to be used as a second control signal.

The two embodiments described above are two implementations in which the controller selects the optimal control signal. The optimum control signal can allow the transimpedance amplifier circuit to perform the optimum compensation that can be performed by the transimpedance amplifier circuit for the optoelectronic detector. Further, gain compensation by the transimpedance amplifier circuit is performed in the transimpedance amplifier circuit, and as a result, no additional noise is introduced.

Referring to the first aspect, in a third possible implementation of the first aspect, the optical receiver further comprises an equalizer, which receives a differential voltage signal and a third control signal. The differential voltage signal is then gained based on the third control signal, and the differential voltage signal obtained after the gain is configured to be sent to the controller and the I / O interface, and the second bandwidth. The frequency response value of the differential voltage signal within is greater than that within the first bandwidth, any frequency within the second bandwidth is higher than any frequency within the first bandwidth, and the controller. It is further configured to generate a fourth control signal based on the differential voltage signal and send the fourth control signal to the equalizer, the fourth control signal performing a gain on the differential voltage signal. Used to control the equalizer so that it does.

An equalizer is used in this embodiment of the present application, so that the range for compensating the optoelectronic detector can be expanded and gain compensation can be performed at higher frequencies than in a transimpedance amplifier circuit.

With reference to the third possible implementation of the first aspect, in the fourth possible implementation of the first aspect, the controller specifically performs a plurality of first sampling processes, each time a first sampling. The process involves the following processes: sending the control signal to a transimpedance amplifier circuit, sampling the upper and lower levels of the received differential voltage signal to obtain sampling point values, and presetting. It is configured to modify the control signal based on the amount of modification of The control signal corresponding to the sampling point having the maximum value among the sampling points of is used as the second control signal.
After sending the second control signal to the transimpedance amplifier circuit, the controller further performs a plurality of second sampling processes, and in each second sampling process, the following process, that is, the control signal is equalized. Performed to send to the instrument, sample the upper and lower levels of the received differential voltage signal to obtain the value of the sampling point, and modify the control signal based on the preset amount of modification. Then, after performing the second sampling process a plurality of times, the controller particularly sends a control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the second sampling process a plurality of times. , Is configured to be used as a fourth control signal.

With reference to the third possible implementation of the first aspect, in the fifth possible implementation of the first aspect, the controller specifically performs a plurality of first detection processes, each time a first detection. In the process, the following process, that is, sending the control signal to the transimpedance amplifier circuit, using the first frequency as the boundary, and the energy of the differential voltage signal higher than the first frequency to obtain the energy difference. The energy of the differential voltage signal lower than the frequency of 1 is detected separately, where the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal. And after performing multiple first detection processes, the controller gets, especially after multiple first detection processes, configured to modify the control signal based on a preset amount of modification. The control signal corresponding to the smallest energy difference among the plurality of energy differences obtained is configured to be used as the second control signal.
After sending the second control signal to the transimpedance amplifier circuit, the controller further performs a plurality of second detection processes, and in each second detection process, the following process, that is, the control signal is equalized. Sending to the vessel, using the first frequency as a boundary, separate the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency to obtain the energy difference. Detect, where the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal and modifies the control signal based on a preset amount of modification. After performing the above and performing the second detection process multiple times, the controller particularly receives the control signal corresponding to the smallest energy difference among the energy differences obtained after the second detection process multiple times. Is configured to be used as a fourth control signal.

The two embodiments described above are two methods in which the controller selects the optimum control signal when the optical receiver includes an equalizer. The transimpedance amplifier circuit is used first to perform gain compensation without introducing additional noise, and if the gain compensation is not sufficient, an equalizer is used to perform gain compensation, and as a result. Optimal compensation effect is achieved with minimal noise cost.

According to a second aspect, an optical receiver comprising an optoelectronic detector, a first transimpedance amplification circuit, a single-ended-differential converter, an equalizer, an I / O interface, and a controller is provided. The photoelectron detector is configured to convert the received optical signal into a current signal, the bandwidth of the photoelectron detector is lower than the system transmission bandwidth requirement, and the first transimpedance amplification circuit is the current signal. Is configured to receive a transimpedance gain on the current signal to obtain a voltage signal, a single-ended-differential converter converts the voltage signal into a differential voltage signal and converts the differential voltage signal into a differential voltage signal. Configured to be sent to the equalizer, the equalizer receives the differential voltage signal and the first control signal, gains on the differential voltage signal based on the first control signal, and gains. The differential voltage signal obtained later is configured to be sent to the I / O interface and controller, and the frequency response value of the differential voltage signal within the first bandwidth is greater than that within the bandwidth of the optoelectronic detector. Any frequency within the first bandwidth is higher than the high frequency cutoff frequency of the optoelectronic detector, the I / O interface is configured to output the differential voltage signal obtained after gain, and the controller It is configured to generate a second control signal based on the differential voltage signal obtained after gain and send the second control signal to the equalizer, the second control signal with respect to the differential voltage signal. It is used to control the equalizer to perform the gain.

In this embodiment of the present application, the equalizer is used to perform gain compensation for high frequencies. Due to the wide coverage of the equalizer, the equalizer can perform compensation for the optoelectronic detector to achieve the optimum effect. Compared to the embodiment provided in the first embodiment, this embodiment has the advantage of having a wider range of compensation for the photoelectron detector, and the gain compensation for high frequencies is fully equalized by the equalizer. As it is implemented, it has the disadvantage of introducing more noise.

Referring to the second aspect, in the first possible implementation of the second aspect, the controller specifically performs a plurality of sampling processes, and in each sampling process the following process, that is, the control signal is equalized. Performed to send to the instrument, sample the upper and lower levels of the received differential voltage signal to obtain sampling point values, and modify the control signal based on a preset amount of modification. After performing multiple sampling processes, the controller particularly sends a control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the multiple sampling processes. It is configured to be used as the control signal of 2.

Referring to the second aspect, in the second possible implementation of the second aspect, the controller specifically performs a plurality of detection processes and equalizes the following process, i.e., the control signal in each detection process. Sending to the vessel, using the first frequency as the boundary, the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency are separated in order to obtain the energy difference. Detect, where the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal and modifies the control signal based on a preset amount of modification. After performing multiple detection processes, the controller specifically sends a control signal corresponding to the smallest energy difference among the multiple energy differences obtained after the multiple detection processes. It is configured to be used as a second control signal.

According to a third aspect, the optical receiver converts the optical signal received by using the optoelectronic detector into a current signal, wherein the optoelectronic detector bandwidth is a system transmission bandwidth requirement. A lower step and a step of performing a transimpedance gain on the current signal based on the first control signal to obtain a voltage signal by the optical receiver, the current signal within the first bandwidth. The frequency response value of is greater than that within the bandwidth of the photoelectron detector, and any frequency within the first bandwidth is greater than or equal to the high frequency cutoff frequency of the photoelectron detector, depending on the step and the optical receiver. A step of converting a voltage signal into a differential voltage signal and a step of generating a second control signal based on the differential voltage signal, the second control signal performing a transimpedance gain on the current signal. A receiving method is provided that includes steps and is used to control the optical receiver so that it does.

With reference to the third aspect, in the first possible implementation of the third aspect, the step of generating the second control signal based on the differential voltage signal is particularly a plurality of sampling processes. The control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the sampling process is used as the second control signal, and the following process is performed in each sampling process. That is, in order to obtain a voltage signal, transimpedance gain is performed on the current signal based on the control signal, the voltage signal is converted into a differential voltage signal, and the differential voltage is obtained in order to obtain the value of the sampling point. It involves sampling the upper and lower levels of the signal and modifying the control signal based on a preset amount of modification.

Referring to the third aspect, in the second possible implementation of the third aspect, the step of generating the second control signal based on the differential voltage signal is particularly a plurality of detection processes. The control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after each detection process is used as the second control signal, and in each detection process, the following process, that is, that is, To obtain a voltage signal, perform a transimpedance gain on the current signal based on the control signal, convert the voltage signal to a differential voltage signal, use the first frequency as the boundary, and obtain the energy difference. Therefore, the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency are detected separately, where the first frequency is 0.28 / Tb. Tb includes being the duration of each bit of the differential voltage signal and performing modification of the control signal based on a preset amount of modification.

Referring to a third aspect, in a third possible implementation of the third aspect, after the step of converting the voltage signal into a differential voltage signal by the optical receiver, the method is based on the third control signal. In the step of performing gain on the differential voltage signal, the frequency response value of the differential voltage signal within the second bandwidth is larger than that within the first bandwidth, and the second bandwidth. The method is based on the differential voltage signal obtained after gain, after the step of further including a step and generating a second control signal, where any frequency within is higher than any frequency within the first bandwidth. A step of generating a fourth control signal, the fourth control signal further comprises a step used to control the optical receiver to perform a gain on the differential voltage signal. ..

With reference to the third possible implementation of the third aspect, in the fourth possible implementation of the third aspect, the step of generating the second control signal based on the differential voltage signal is particularly plurality of times. Performing the first sampling process and using the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the first sampling process a plurality of times as the second control signal. In the first sampling process of each time, the following process, that is, transimpedance gain is performed on the current signal based on the control signal in order to obtain the voltage signal, and the voltage signal is converted into a differential voltage signal. The conversion, the sampling of the upper and lower levels of the differential voltage signal to obtain the value of the sampling point, and the modification of the control signal based on the preset amount of modification are performed. The step of generating the fourth control signal based on the differential voltage signal includes, in particular, performing the second sampling process multiple times and of the plurality of sampling points obtained after the second sampling process multiple times. The control signal corresponding to the sampling point having the maximum value among them is used as the fourth control signal, and in each second sampling process, the following process, that is, the differential voltage based on the control signal is used. Gaining the signal to obtain the differential voltage signal obtained after gain, sampling the upper and lower levels of the differential voltage signal obtained after gain to obtain the value of the sampling point. Including that the control signal is modified based on the preset modification amount.

With reference to the third possible implementation of the third aspect, in the fifth possible implementation of the third aspect, the step of generating the second control signal based on the differential voltage signal is particularly plural. The first detection process is performed, and the control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the first detection process is used as the second control signal. Then, in the first detection process of each time, the following process, that is, in order to obtain a voltage signal, a transimpedance gain is performed on the current signal based on the control signal, and the voltage signal is converted into a differential voltage signal. This includes sampling the upper and lower levels of the differential voltage signal to obtain the value of the sampling point, and modifying the control signal based on a preset amount of modification. The step of generating the fourth control signal based on the differential voltage signal particularly performs a plurality of second detection processes and among the plurality of energy differences obtained after the multiple second sampling processes. The control signal corresponding to the minimum energy difference is used as the fourth control signal, and in the second detection process of each time, the following process, that is, with respect to the differential voltage signal based on the control signal. Perform gain to obtain the differential voltage signal obtained after gain, use the first frequency as the boundary, and use the energy of the differential voltage signal higher than the first frequency to obtain the energy difference. The energy of the differential voltage signal lower than the frequency of 1 is detected separately, where the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal. And the modification of the control signal is performed based on the preset modification amount.

The embodiment in the third aspect is the receiving method corresponding to the optical receiver in the first aspect, the beneficial effect is the same as that of the first aspect, and the details are described again herein. Not done.

According to a fourth aspect, the optical receiver converts the optical signal received by using the optoelectronic detector into a current signal, wherein the optoelectronic detector bandwidth is a system transmission bandwidth requirement. Lower, by the optical receiver, by performing a transimpedance gain on the current signal to obtain the voltage signal, and by converting the voltage signal to a differential voltage signal, by the optical receiver. The step of performing a gain on the differential voltage signal based on the control signal of 1 to obtain the differential voltage signal obtained after the gain, which is the frequency response of the differential voltage signal within the first bandwidth. The value is obtained after gain by the step and the optical receiver, where the value is greater than that within the optical electron detector bandwidth and any frequency within the first bandwidth is higher than the optical electron detector's high frequency cutoff frequency. A step of generating a second control signal based on the differential voltage signal, which is used to control the optical receiver to perform a gain on the differential voltage signal. A receiving method including the steps to be performed is provided.

Referring to a fourth aspect, in the first possible implementation of the fourth aspect, the step of generating a second control signal based on the differential voltage signal obtained after gain is particularly multiple sampling processes. Is performed, and the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the plurality of sampling processes is used as the second control signal, and each sampling process is performed. In the following process, ie, gaining the differential voltage signal based on the control signal to obtain the differential voltage signal obtained after the gain, obtaining after the gain to obtain the value of the sampling point. It involves sampling the upper and lower levels of the differential voltage signal obtained, and modifying the control signal based on a preset amount of modification.

Referring to the fourth aspect, in the second possible implementation of the fourth aspect, the step of generating the second control signal based on the differential voltage signal obtained after gain is particularly a plurality of detection processes. Is performed, and the control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the plurality of detection processes is used as the second control signal. To obtain the differential voltage signal obtained after the gain by performing a gain on the differential voltage signal based on the control signal, using the first frequency as the boundary to obtain the energy difference. Therefore, the energy of the differential voltage signal obtained after gain and higher than the first frequency and the energy of the differential voltage signal obtained after gain and lower than the first frequency are detected separately. Here, the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal, and the control signal can be modified based on a preset modification amount. Including being carried out.

The embodiment in the fourth aspect is the receiving method corresponding to the optical receiver in the second aspect, the beneficial effect is the same as that of the second aspect, and the details are described again herein. Not done.

According to the fifth aspect, it is a transimpedance amplification circuit including a fixed resistor, a first transistor, a second transistor, a variable resistance circuit, and an output port, and the fixed resistor has two ports. One port is grounded, the other port is connected to the emitter of the first transistor, the base of the first transistor is configured to receive the input signal, and the collector of the first transistor , Connected to the emitter of the second transistor, the base of the second transistor is configured to receive the bias voltage signal, the collector of the second transistor is connected to the first port of the variable resistor circuit, The bias voltage signal is used to adjust the gain for the input signal, and the output port is located on the connection line between the collector of the second transistor and the first port of the variable resistor circuit and is variable. The resistance circuit includes three ports, the second port of the variable resistance circuit is configured to receive the control signal, the third port of the variable resistance circuit is grounded, and the control signal is the resistance of the variable resistance circuit. Transistor impedance amplification circuits used to control values are provided.

In conclusion, according to the optical receiver provided in the embodiments of the present application, an optical electron detector whose bandwidth is lower than the system transmission bandwidth requirement is used to significantly reduce the cost of the optical receiver and transimpedance. The amplifier circuit is used to repair the degradation of the received signal caused by the lack of bandwidth, so that the quality of the received signal is ensured while the component cost is reduced.

It is a schematic structural drawing of a 10G PON system. It is the schematic structural drawing of the optical receiver by one Embodiment of this application. It is a schematic structure diagram of the transimpedance amplifier circuit by another embodiment of this application. It is a figure of the frequency response curve of the transimpedance amplifier circuit by another embodiment of this application. FIG. 5 is a schematic diagram in which a transimpedance amplifier circuit according to another embodiment of the present application performs gain compensation for a high frequency of a photoelectron detector. It is a schematic diagram of under-compensation, optimal compensation, and over-compensation. It is the schematic structural drawing of the optical receiver by another embodiment of this application. It is a flowchart of the receiving method by another embodiment of this application. It is the schematic structural drawing of the optical receiver by another embodiment of this application. It is a flowchart of the receiving method by another embodiment of this application. It is the schematic structural drawing of the optical receiver by another embodiment of this application.

The technical solutions of the embodiments of the present application are described below with reference to the accompanying drawings of the embodiments of the present application.

Referring to FIG. 1, FIG. 1, ONU also has an optical receiver provided in an embodiment of the present application is a schematic structural diagram of a 10G PON system O ptical Line Terminal (OLT) is applicable. The 10G PON system 100 includes at least one OLT 110, a plurality of ONU 120s, and one Optical Distribution Network (ODN) 130. The OLT 110 is connected to a plurality of ONUs 120 by using the ODN 130 in a point-to-multipoint manner. The direction from the OLT 110 to the ONU 120 is defined as the downlink direction, and the direction from the ONU 120 to the OLT 110 is defined as the uplink direction.

One embodiment of the present application provides an optical receiver 200, which can be applied to an ONU in a 10G PON system or a faster PON system. As shown in FIG. 2, the optical receiver 200 includes a photoelectron detector 201, a transimpedance amplifier circuit 202, a single-ended-differential converter 203, an I / O interface 204, and a controller 205. ..

The optoelectronic detector 201 is configured to convert the received optical signal into a current signal, and the bandwidth of the optoelectronic detector 201 is lower than the system transmission bandwidth requirement.

In particular, the optoelectronic detector 201 reflects the largest portion of the cost in the optical receiver 200, so component costs can be significantly reduced by using the low bandwidth optoelectronic detector 201. Correspondingly, there is a problem that a high frequency signal cannot be detected.

The transimpedance amplifier circuit 202 is configured to receive a current signal and a first control signal and perform a transimpedance gain on the current signal based on the first control signal in order to obtain a voltage signal. The frequency response value of the current signal within the bandwidth of 1 is greater than that within the bandwidth of the photoelectron detector 201, and any frequency within the first bandwidth is greater than or equal to the high frequency cutoff frequency of the photoelectron detector 201. be.

Optionally, the transimpedance amplifier circuit 202 may be an underdump transimpedance amplifier circuit. The present application provides possible implementations. The structure of the underdump transimpedance amplifier circuit is shown in FIG. 3, which includes a fixed resistor 301, a first transistor 302, a second transistor 303, a variable resistor circuit 304, and an output port 305.

The fixed resistor 301 includes two ports. One port is grounded and the other port is connected to the emitter of the first transistor 302. The base of the first transistor 302 is configured to receive an input signal, and the collector of the first transistor 302 is connected to the emitter of the second transistor 303. The base of the second transistor 303 is configured to receive a bias voltage signal, and the collector of the second transistor 303 is connected to the first port of the variable resistor circuit 304. The bias voltage signal is used to adjust the gain for the input signal. The output port 305 is located on the connection line between the collector of the second transistor 303 and the first port of the variable resistor circuit 304. The variable resistor circuit 304 includes three ports. The second port of the variable resistance circuit 304 is configured to receive a control signal, the third port of the variable resistance circuit 304 is grounded, and the control signal is used to control the resistance value of the variable resistance circuit 304. used.

30 4 in FIG. 3 shows a specific implementation solutions of the variable resistance circuit, it is to be understood that there is still a large number of similar implementations solution. This is not limited in this application.

In this embodiment of the present application, the resistance value of the variable resistance circuit 304 is adjusted to change the attenuation factor of the transimpedance amplifier circuit 202. A smaller attenuation factor results in a larger additional gain for high frequencies. The frequency response curve of the transimpedance amplifier circuit 202 is shown in FIG. 4, and ζ in FIG. 4 is the attenuation factor. The high frequency in the present specification is a frequency higher than the high frequency cutoff frequency of the photoelectron detector 201.

First bandwidth of the transimpedance amplifier circuit 202, it should be noted that it may be controlled by using the existing technical solutions. This is not limited in this application. Moreover, the smaller damping factor causes more severe system vibrations, so the damping factor cannot be made too small. Due to the value limitation of the attenuation factor, there is an additional gain value range for high frequencies by the transimpedance amplifier circuit 202. As shown in FIG. 5, the solid line represents the frequency response curve of the photoelectron detector 201, and the broken line is the frequency response curve in which the transimpedance amplifier circuit 202 and the photoelectron detector 201 are combined. For example, at position a, the difference to be compensated does not exceed the range of additional gain for high frequencies by the transimpedance amplifier circuit 202, so compensation may be performed by using the transimpedance amplifier circuit 202. well, the position b, the difference to be compensated is beyond the scope of the additional gain for the high-frequency by the transimpedance amplifier circuit 202, therefore, complete compensation, only by using the transimpedance amplifier circuit 202 Cannot be implemented. In this case, compensation of the next order is required.

The single-ended-differential converter 203 is configured to convert the voltage signal into a differential voltage signal and send the differential voltage signal to the I / O interface 204 and the controller 205.

The I / O interface 204 is configured to output a differential voltage signal.

The controller 205 is configured to generate a second control signal based on the differential voltage signal and send the second control signal to the transimpedance amplifier circuit 202, the second control signal with respect to the current signal. It is used to control the transimpedance amplifier circuit 202 to perform transimpedance gain.

In particular, the signal processing process of the optical receiver 200 is as follows.

The optical signal detected by the optical receiver 200 first passes through the photoelectron detector 201 for photoelectron detection to generate a current signal, and the current signal passes through the transimpedance amplifier circuit 202 and then. Converted to a voltage signal. The transimpedance amplifier circuit can provide a primary high frequency gain, which is carried out within the transimpedance amplifier circuit 202. As shown in FIG. 3, the resistance value of the variable resistance circuit 304 produces a peak gain at the gain frequency and compensates for the lack of bandwidth of the photoelectron detector 201 (ie, of the transimpedance amplifier circuit 202). Adjusted to provide higher gain at high frequencies within the passband range). Since the gain is performed within the transimpedance amplifier circuit 202 without introducing additional noise, noise-free gain compensation can be performed for high frequencies. The high frequency in the present specification is also a frequency higher than the high frequency cutoff frequency of the photoelectron detector 201.

The signal for which gain compensation is performed by the transimpedance amplifier circuit 202 is converted into a differential signal by the single-ended-differential converter 203, and the differential signal is output by using the I / O interface 204.

Further, the controller 205 is configured to adaptively generate a second control signal and control the transimpedance amplifier circuit 202 so as to perform transimpedance gain on the received current signal, and transimpedance amplifier. The circuit 202 allows the photoelectron detector 201 to perform the optimum compensation at this stage. Three compensation possibilities, namely undercompensation, optimal compensation, and overcompensation, are shown in FIG.

The second control signal, which optionally allows the transimpedance amplifier circuit 202 to perform optimum compensation at this stage, is mainly generated by the following two methods.

(1) The controller 205 executes a plurality of sampling processes, and executes the following process in each sampling process.

First, the controller 205 sends a control signal to the transimpedance amplifier circuit 202.

In this case, the transimpedance amplifier circuit 202 generates a transimpedance gain determined by the control signal for the current signal in order to obtain the voltage signal, and the voltage signal is single-ended to obtain the differential voltage signal. It passes through the differential converter 203.

Controller 205 then samples the upper and lower levels of the received differential voltage signal to obtain the value of the sampling point.

Finally, the controller 205 modifies the control signal based on the preset modification amount.

In other words, each sampling process is performed on the signals obtained after different transimpedance gains in order to obtain different sampling points. The sampling point having the maximum value is selected from the obtained sampling points, and the control signal corresponding to the sampling point can enable the transimpedance amplifier circuit 202 to perform the optimum compensation at this stage. ..

Therefore, after performing the sampling process a plurality of times, the controller 205 particularly controls the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the sampling processing a plurality of times. It is configured to be used as a signal.

(2) The controller 205 executes the detection process a plurality of times, and executes the following process in each detection process.

First, the controller 205 sends a control signal to the transimpedance amplifier circuit 202.

In this case, the transimpedance amplifier circuit 202 generates a transimpedance gain determined by the control signal for the current signal in order to obtain the voltage signal, and the voltage signal is single-ended to obtain the differential voltage signal. It passes through the differential converter 203.

The controller 205 then uses the first frequency as a boundary to separate the energy of the differential voltage signal above the first frequency and the energy of the differential voltage signal below the first frequency in order to obtain the energy difference. The first frequency is 0.28 / Tb, where Tb is the duration of each bit of the received differential voltage signal.

Finally, the controller 205 modifies the control signal based on the preset modification amount.

In other words, each detection process is performed on the signals obtained after different transimpedance gains in order to obtain different energy differences. The minimum energy difference is selected from the resulting energy difference, and the control signal corresponding to that energy difference can allow the transimpedance amplifier circuit 202 to perform optimal compensation at this stage.

Therefore, after performing the detection processing a plurality of times, the controller 205 particularly uses the control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the detection processing a plurality of times as the second control signal. It is configured to be used.

It should be understood that the second control signal may be selected at intervals. The execution time of the above-mentioned selection process is very short compared to the interval time, so the service transmission is not affected. Further, the compensation effect of the transimpedance amplifier circuit 202 fluctuates with the environmental change, and the environmental change (temperature change, etc.) is a gradual process. Therefore, the control signal used during the current run can be modified several times only within a relatively small range, and the optimal control signal uses one of the methods (1) and (2) described above. Is selected by. In this way, the execution time of the selection process can be effectively reduced.

Optionally, the optical receiver 200 further includes an equalizer 206. As shown in FIG. 7, the equalizer 206 receives the differential voltage signal and the third control signal and performs a gain on the differential voltage signal based on the third control signal. The differential voltage signal obtained after gain is configured to be sent to the controller and I / O interface, and the frequency response value of the differential voltage signal within the second bandwidth is greater than that within the first bandwidth. , Any frequency within the second bandwidth is higher than any frequency within the first bandwidth.

In this case, the controller 205 is further configured to generate a fourth control signal based on the differential voltage signal and send the fourth control signal to the equalizer 206, the fourth control signal being differential. It is used to control the equalizer 206 to perform a gain on a voltage signal.

In particular, in this embodiment of the present application, the differential voltage signal output by the single-ended-differential converter 203 first passes through the equalizer 206. If the gain compensation needs to be further optimized, the equalizer 206 performs additional gain on the differential voltage signal, and if the gain compensation is optimal, the equalizer 206 is on the signal. On the other hand, no processing is performed and it is equivalent to a transmission circuit.

Further, the controller 205 is configured to adaptively generate a fourth control signal and control the equalizer 206 to perform gain on the received differential voltage signal. Allows the optimum compensation for the photoelectron detector 201 to be implemented. The equalizer 206 may be an analog equalizer or a digital equalizer.

Optionally, a second control signal that allows the transimpedance amplifier circuit 202 to perform optimal compensation and a fourth control signal that allows the equalizer 206 to perform optimal compensation , Mainly generated by the following two methods.

(1) The controller 205 executes the first sampling process a plurality of times, and in each of the first sampling processes, the following process, that is,
The controller 205 sends the control signal to the transimpedance amplifier circuit 202.
The controller 205 samples the upper and lower levels of the received differential voltage signal to obtain the value of the sampling point, and the controller 205 modifies the control signal based on a preset amount of modification. Do that.

After performing the first sampling process a plurality of times, the controller 205 sends a control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the first sampling process a plurality of times. It is used as a control signal of 2.

After sending the second control signal to the transimpedance amplifier circuit 202, the controller 205 further performs a plurality of second sampling processes, and in each second sampling process, the following process, that is,
Sending a control signal to the equalizer 206 by controller 205,
The controller 205 samples the upper and lower levels of the received differential voltage signal to obtain the value of the sampling point, and the controller 205 modifies the control signal based on a preset amount of modification. Do that.

After performing the second sampling process a plurality of times, the controller 205 sends a control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the second sampling process a plurality of times. It is used as a control signal of 4.

(2) The controller 205 executes the first detection process a plurality of times, and in each first detection process, the following process, that is,
The controller 205 sends the control signal to the transimpedance amplifier circuit 202.
The controller 205 uses the first frequency as the boundary and separately detects the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency in order to obtain the energy difference. Here, the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal, and the controller 205 controls the signal based on a preset amount of correction. Implement to correct.

After performing the first detection processing a plurality of times, the controller 205 sends a control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the first detection processing a plurality of times to the second. Used as a control signal

After sending the second control signal to the transimpedance amplifier circuit 202, the controller 205 further performs the second detection process a plurality of times, and in each second detection process, the following process, that is,
Sending a control signal to the equalizer by controller 205,
The controller 205 uses the first frequency as the boundary and separately detects the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency in order to obtain the energy difference. Here, the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal, and the controller 205 controls the signal based on a preset amount of correction. Implement to correct.

After performing the second detection processing a plurality of times, the controller 205 sends a control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the second detection processing a plurality of times to the fourth. Used as a control signal

When the equalizer 206 does not gain gain on the differential voltage signal, if the obtained value of the sampling point is the largest or the obtained energy difference is the smallest, it is because the transimpedance amplifier circuit 202 is an optoelectronic. It should be noted that the optimum compensation for the detector 201 has already been implemented, indicating that the equalizer 206 does not need to function, otherwise it indicates that the equalizer 206 needs to function. sea bream.

Further, the gain compensation by the transimpedance amplifier circuit 202 is performed in the transimpedance amplifier circuit 202 without introducing additional noise, but the equalizer 206 introduces additional noise during compensation. Therefore, the transimpedance amplifier circuit 202 is preferentially adjusted. However, the equalizer 206 has the advantage of a wide compensation range and can perform compensation for higher frequencies than the transimpedance amplifier circuit 202. If the transimpedance amplifier circuit 202 is unable to provide optimum compensation, the equalizer 206 may provide additional compensation to achieve the optimum compensation effect.

Further, the second control signal and the fourth control signal may be selected at intervals. The execution time of the above-mentioned selection process is very short compared to the interval time, so the service transmission is not affected. Further, the compensation effect of the transimpedance amplifier circuit 202 and the equalizer 206 fluctuates with the environmental change, and the environmental change (temperature change and the like) is a gradual process. Therefore, only the control signal used during the current execution can be modified several times within a relatively small range, and the optimal control signal uses one of the methods (1) and (2) described above. Is selected by. In this way, the execution time of the selection process can be effectively reduced.

Another embodiment of the present application provides a receiving method. As shown in FIG. 8, this method involves the following steps:

801. The optical receiver converts the optical signal received by using the optoelectronic detector into a current signal, and the bandwidth of the optoelectronic detector is lower than the system transmission bandwidth requirement.

802. The optical receiver performs a transimpedance gain on the current signal based on the first control signal in order to obtain the voltage signal, and the frequency response value of the current signal within the first bandwidth is the photoelectron detector. Any frequency within the first bandwidth is greater than or equal to the high frequency cutoff frequency of the photoelectron detector.

803. The optical receiver converts the voltage signal into a differential voltage signal and generates a second control signal based on the differential voltage signal, which performs a transimpedance gain on the current signal. Used to control the optical receiver.

An optional solution for the optical receiver to generate a second control signal based on the differential voltage signal is as follows.

(1) The control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after performing the sampling process a plurality of times is used as the second control signal. In each sampling process, the following process, that is,
To obtain a voltage signal, perform transimpedance gain on the current signal based on the control signal, convert the voltage signal to a differential voltage signal, and to obtain the value of the sampling point of the differential voltage signal. Sampling the upper and lower levels and modifying the control signal based on a preset amount of modification is performed.

(2) The control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the multiple detection processes is performed as the second control signal, and each time the detection process is performed. In the detection process, the following process, that is,
To obtain a voltage signal, perform a transimpedance gain on the current signal based on the control signal, convert the voltage signal to a differential voltage signal, use the first frequency as the boundary, and obtain the energy difference. Therefore, the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency are detected separately, where the first frequency is 0.28 / Tb. Tb is the duration of each bit of the differential voltage signal, and the control signal is modified based on a preset modification amount.

In short, in both of the above two solutions, the control signal is modified so that the received signal is in a different status, and by comparing these statuses, a relatively optimal control signal is selected. NS.

After optionally converting the voltage signal into a differential voltage signal by the optical receiver, this method is a step of performing a gain on the differential voltage signal based on a third control signal. , The frequency response value of the differential voltage signal within the second bandwidth is greater than that within the first bandwidth, and any frequency within the second bandwidth is any frequency within the first bandwidth. Higher, including more steps. After generating the second control signal, this method is a step of generating a fourth control signal based on the differential voltage signal obtained after gain, wherein the fourth control signal is a differential voltage signal. It further comprises a step used to control the optical receiver to perform gain on.

In this case, the solution for the optical receiver to generate the second control signal and the fourth control signal based on the differential voltage signal is as follows.

(1) The control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the first sampling process of the plurality of times is performed and the control signal corresponding to the sampling point having the maximum value is obtained by the second sampling process. It is used as a control signal, and in each first sampling process, the following process, that is,
To obtain a voltage signal, perform transimpedance gain on the current signal based on the control signal, convert the voltage signal to a differential voltage signal, and to obtain the value of the sampling point of the differential voltage signal. Sampling the upper and lower levels and modifying the control signal based on a preset amount of modification is performed.

After generating the second control signal, the optical receiver performs a plurality of second sampling processes and has the maximum value among the plurality of sampling points obtained after the plurality of second sampling processes. The control signal corresponding to the sampling point is used as the fourth control signal, and in each second sampling process, the following process, that is,
Gaining the differential voltage signal based on the control signal to obtain the differential voltage signal obtained after the gain, and obtaining the value of the sampling point of the differential voltage signal obtained after the gain The upper and lower levels are sampled and the control signal is modified based on a preset amount of modification.

(2) The control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the first detection process is performed a plurality of times and the first detection process is performed a plurality of times, and the second control signal is used. In the first sampling process of each time, the following process, that is,
To obtain a voltage signal, perform transimpedance gain on the current signal based on the control signal, convert the voltage signal to a differential voltage signal, and to obtain the value of the sampling point of the differential voltage signal. Sampling the upper and lower levels and modifying the control signal based on a preset amount of modification is performed.

After generating the second control signal, the optical receiver performs a plurality of second detection processes, and is the smallest energy difference among the plurality of energy differences obtained after the plurality of second sampling processes. The control signal corresponding to is used as the fourth control signal, and in the second detection process of each time, the following process, that is, gaining is performed on the differential voltage signal based on the control signal, and after the gain To obtain the obtained differential voltage signal, use the first frequency as a boundary, and obtain the energy of the differential voltage signal higher than the first frequency and the differential voltage lower than the first frequency in order to obtain the energy difference. The energy of the signal is detected separately, where the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal, and based on a preset amount of correction. The control signal is modified.

This embodiment of the present application is a method embodiment corresponding to the above-described device embodiment, and the mounting principle and the effect to be achieved are described in the above-mentioned embodiment, and the details are described in this embodiment of the present application. Not listed again.

Another embodiment of the present application provides an optical receiver 900, which can be applied to an ONU in a 10G PON system or a faster PON system. As shown in FIG. 9, the optical receiver 900 includes a photoelectron detector 901, a first transimpedance amplifier circuit 902, a single-ended-differential converter 903, an equalizer 904, and an I / O. It includes an interface 905 and a controller 906.

Optoelectronic detector 901 is configured to convert the received optical signal into a current signal, the bandwidth of an optoelectronic detector 9 01 is lower than the system transmission bandwidth requirements.

In particular, the optoelectronic detector 901 reflects the largest portion of the cost in the optical receiver 900, so component costs can be significantly reduced by using the low bandwidth optoelectronic detector 901. Correspondingly, there is a problem that a high frequency signal cannot be detected.

The first transimpedance amplifier circuit 902 is configured to receive a current signal and perform a transimpedance gain on the current signal in order to obtain a voltage signal.

The single-ended-differential converter 903 is configured to convert the voltage signal into a differential voltage signal and transmit the differential voltage signal to the equalizer 904.

The equalizer 904 receives the differential voltage signal and the first control signal, gains the differential voltage signal based on the first control signal, and obtains the differential voltage signal after the gain. Configured to transmit to the I / O interface 905 and controller 906, the frequency response value of the differential voltage signal within the first bandwidth is greater than that within the bandwidth of the optoelectronic detector 901, the first band. Any frequency within the width is higher than the high frequency cutoff frequency of the photoelectron detector 901.

The equalizer 904 in the present specification may be an analog equalizer or a digital equalizer.

The I / O interface 905 is configured to output the differential voltage signal obtained after gain.

The controller 906 is configured to generate a second control signal based on the differential voltage signal obtained after gain and transmit the second control signal to the equalizer 904. It is used to control the equalizer 904 to perform gain on the differential voltage signal.

In this embodiment of the present application, the equalizer 904 is used to perform gain compensation for high frequencies. Due to the wide compensation range feature of the equalizer 904, the equalizer 904 can perform compensation for the optoelectronic detector 901 to achieve the optimum effect. Compared to the previous embodiment without an equalizer, this embodiment has the advantage of having a wider range of compensation for the photoelectron detector 901, and the gain compensation for high frequencies is entirely by the equalizer. As it is implemented, it has the disadvantage of introducing more noise.

The second control signal, which optionally allows the equalizer 904 to perform the optimum compensation for the optoelectronic detector 901 at this stage, is mainly generated by the following two methods.

(1) The controller 906 executes a plurality of sampling processes, and executes the following process in each sampling process.

First, the controller 906 transmits a control signal to the equalizer 904.

In this case, the equalizer 904 generates a gain determined by the control signal for the differential voltage signal, and obtains the differential voltage signal obtained after the gain.

The controller 906 then samples the upper and lower levels of the differential voltage signal obtained after gain to obtain the value of the sampling point.

Finally, the controller 906 modifies the control signal based on a preset modification amount.

In other words, each sampling process is performed on the signals obtained after different gains in order to obtain different sampling points. Sampling points having the maximum value is selected from the obtained sampling points, the control signal corresponding to the sampling point, the equalizer 9 04 can make it possible to implement the optimal compensation.

Therefore, after performing the sampling process a plurality of times, the controller 906 particularly controls the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the sampling process a plurality of times. It is configured to be used as a signal.

(2) The controller 906 executes the detection process a plurality of times, and executes the following process in each detection process.

First, the controller 906 transmits a control signal to the equalizer 904.

In this case, the equalizer 904 generates a gain determined by the control signal for the differential voltage signal, and obtains the differential voltage signal obtained after the gain.

The controller 906 then uses the first frequency as a boundary to separate the energy of the differential voltage signal above the first frequency and the energy of the differential voltage signal below the first frequency in order to obtain the energy difference. Here, the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal.

Finally, the controller 906 modifies the control signal based on a preset modification amount.

In other words, each detection process is performed on the signals obtained after different gains in order to obtain different energy differences. Minimum energy difference is selected from the resulting energy difference, the control signal corresponding to the energy difference, the equalizer 9 04 can make it possible to implement the optimal compensation.

Therefore, after performing the detection processing a plurality of times, the controller 906 particularly uses the control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the detection processing a plurality of times as the second control signal. It is configured to be used.

Another embodiment of the present application provides a receiving method. As shown in FIG. 10, this method involves the following steps:

1001. The optical receiver converts the received optical signal into a current signal by using the optoelectronic detector, and the bandwidth of the optoelectronic detector is lower than the system transmission bandwidth requirement.

1002. The optical receiver performs transimpedance gain on the current signal and converts the voltage signal into a differential voltage signal in order to obtain the voltage signal.

1003. The optical receiver performs gain on the differential voltage signal based on the first control signal to obtain the differential voltage signal obtained after the gain, but the differential voltage signal within the first bandwidth. The frequency response value of is larger than that within the bandwidth of the photoelectron detector, and any frequency within the first bandwidth is higher than the high cutoff frequency of the photoelectron detector.

1004. The optical receiver generates a second control signal based on the differential voltage signal obtained after the gain, and the second control signal causes the optical receiver to perform the gain on the differential voltage signal. Used to control.

Arbitrarily, the generation of the control signal having the relatively best compensation effect based on the differential voltage signal obtained after the gain is mainly carried out by the following two methods.

(1) The control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after performing the sampling process a plurality of times is used as the second control signal. In each sampling process, the following process, that is,
Gaining the differential voltage signal based on the control signal to obtain the differential voltage signal obtained after the gain, and obtaining the value of the sampling point of the differential voltage signal obtained after the gain The upper and lower levels are sampled and the control signal is modified based on a preset amount of modification.

(2) The control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the multiple detection processes is performed as the second control signal, and each time the detection process is performed. In the detection process, the following process, that is,
Gain on the differential voltage signal based on the control signal to get the differential voltage signal obtained after gain, use the first frequency as the boundary and after gain to get the energy difference The energy of the obtained differential voltage signal higher than the first frequency and the energy of the obtained differential voltage signal after gain and lower than the first frequency are detected separately, and here, the first The frequency of 1 is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal, and the control signal is modified based on a preset modification amount.

The control methods in the plurality of embodiments described above are all adaptive feedback control methods. The present application provides multiple possible implementations, and any similar control solution shall fall within the scope of the present application.

Further, in addition to the adaptive feedback control scheme, equalization adjustment can be further controlled and performed in a programmable analog or digital scheme. The optical receiver in this solution may include components similar to those included in any of the optical receivers shown in FIG. 2, FIG. 7, or FIG. The functions of the optoelectronic detector, transimpedance amplifier circuit, single-ended-differential converter, equalizer, and I / O interface are all the same as in the previous embodiment, the only difference being that the controller is differential. The point is that it is not necessary to receive the voltage signal, and therefore no sampling process or detection process is performed on the differential voltage signal. The correspondence between external environmental changes and control signals, such as the relationship between temperature and control signals, is estimated based on relevant information such as simulation results at the product design stage, and the corresponding control signals are based on external temperature values. Is selected directly. For reference, FIG. 11 is a schematic structural diagram of an optical receiver that includes the same components as those included in the optical receiver shown in FIG.

The relationship between changes in the external environment and the control signal may be pre-stored in the controller or stored in another drive component, which controls or controls the controller to work. It should be understood that if the operator controls the controller to work on a response basis, it may be printed. This is not limited in this application.

According to the optical receivers provided in a plurality of embodiments of the present application, an optical electron detector whose bandwidth is lower than the system transmission bandwidth requirement is used to significantly reduce the cost of the optical receiver and transimpedance. Amplifier circuits and / or equalizers are used to repair the degradation of the received signal caused by lack of bandwidth, resulting in reduced component costs while ensuring the quality of the received signal.

The above description is merely a specific implementation of the present application and is not intended to limit the scope of protection of the present application. Any modification or substitution readily identified by one of ordinary skill in the art within the technical scope disclosed in the present application shall fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be covered by the scope of protection of the claims.

Claims (19)

An optical receiver equipped with a photoelectron detector, a transimpedance amplifier circuit, a single-ended-differential converter, an I / O interface, and a controller.
The optoelectronic detector is configured to convert the received optical signal into a current signal, the optoelectronic detector bandwidth being lower than the system transmission bandwidth requirement.
The transimpedance amplifier circuit is configured to receive the current signal and the first control signal and perform a transimpedance gain on the current signal based on the first control signal in order to obtain a voltage signal. The frequency response value of the current signal within the first bandwidth of the transimpedance amplifier circuit is larger than that within the bandwidth of the photoelectron detector, and any frequency within the first bandwidth is used. It is equal to or higher than the high frequency cutoff frequency of the photoelectron detector.
The single-ended-differential converter is configured to convert the voltage signal into a differential voltage signal and transmit the differential voltage signal to the I / O interface and the controller.
The I / O interface is configured to output the differential voltage signal.
The controller, on the basis of the differential voltage signal to generate the first control signal is composed of the first control signal to be sent to the transimpedance amplifying circuit, said first control signal, An optical receiver used to control a transimpedance amplifier circuit to perform a transimpedance gain on the current signal. In particular, the controller performs a plurality of sampling processes, and in each sampling process, the following process, that is,
Sending a control signal to the transimpedance amplifier circuit,
To obtain the value of the sampling point, sample the upper and lower levels of the received differential voltage signal, and modify the control signal based on a preset modification amount. Configured
After performing the plurality of sampling processes, the controller particularly
The first aspect of claim 1, wherein the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the plurality of sampling processes is used as the first control signal. Optical receiver. In particular, the controller performs a plurality of detection processes, and in each detection process, the following process, that is,
Sending a control signal to the transimpedance amplifier circuit,
Using the first frequency as a boundary, the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency are detected separately in order to obtain an energy difference. Here, the first frequency is 0.28 / Tb, and Tb is the duration of each bit of the differential voltage signal, and the control signal is transmitted based on a preset correction amount. Configured to carry out modifications,
After performing the plurality of detection processes, the controller particularly
The optical reception according to claim 1, wherein the control signal corresponding to the minimum energy difference among the plurality of energy differences obtained after the plurality of detection processes is used as the first control signal. Machine. Including an equalizer,
The equalizer receives the differential voltage signal and the second control signal, gains the differential voltage signal based on the second control signal, and obtains a difference after the gain. The dynamic voltage signal is configured to be transmitted to the controller and the I / O interface, and the frequency response value of the differential voltage signal within the second bandwidth is greater than that within the first bandwidth. Any frequency within the second bandwidth is higher than any frequency within the first bandwidth.
The controller, on the basis of the differential voltage signal to generate the second control signal, is further configured to transmit the second control signal to said equalizer, said second control signal, The optical receiver according to claim 1, which is used to control the equalizer to perform gain on the differential voltage signal. In particular, the controller performs a plurality of first sampling processes, and in each of the first sampling processes, the following process, that is,
Sending a control signal to the transimpedance amplifier circuit,
To obtain the value of the sampling point, sample the upper and lower levels of the received differential voltage signal, and modify the control signal based on a preset modification amount. Configured
After performing the first sampling process multiple times, the controller specifically
The control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the plurality of first sampling processes is configured to be used as the first control signal.
After sending the first control signal to the transimpedance amplifier circuit, the controller further performs a plurality of second sampling processes, and in each second sampling process, the following process, that is,
Sending a control signal to the equalizer,
In order to obtain the value of the sampling point, the upper level and the lower level of the received differential voltage signal are sampled, and the control signal is modified based on the preset modification amount. ,
After performing the second sampling process a plurality of times, the controller particularly
The claim is configured to use the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the plurality of second sampling processes as the second control signal. 4. The optical receiver according to 4. In particular, the controller performs a plurality of first detection processes, and in each first detection process, the following process, that is,
Sending a control signal to the transimpedance amplifier circuit,
Using the first frequency as a boundary, the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency are detected separately in order to obtain an energy difference. Here, the first frequency is 0.28 / Tb, and Tb is the duration of each bit of the differential voltage signal, and the control signal is transmitted based on a preset correction amount. Configured to carry out modifications,
After performing the first detection process a plurality of times, the controller particularly
The control signal corresponding to the minimum energy difference among the plurality of energy differences obtained after the plurality of first detection processes is used as the first control signal.
After sending the first control signal to the transimpedance amplifier circuit, the controller further performs a plurality of second detection processes, and in each second detection process, the following process, that is,
Sending a control signal to the equalizer,
Using the first frequency as a boundary, the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency are separately used to obtain an energy difference. Detected, where the first frequency is 0.28 / Tb, where Tb is the duration of each bit of the differential voltage signal, and said based on the preset amount of correction. Implemented to modify the control signal,
After performing the second detection process a plurality of times, the controller particularly
According to claim 4, the control signal corresponding to the minimum energy difference among the plurality of energy differences obtained after the plurality of second detection processes is used as the second control signal. The optical receiver described. An optical receiver including a photoelectron detector, a first transimpedance amplifier circuit, a single-ended-differential converter, an equalizer, an I / O interface, and a controller.
The optoelectronic detector is configured to convert the received optical signal into a current signal, the optoelectronic detector bandwidth being lower than the system transmission bandwidth requirement.
The first transimpedance amplifier circuit is configured to receive the current signal and perform a transimpedance gain on the current signal in order to obtain a voltage signal.
The single-ended-differential converter is configured to convert the voltage signal into a differential voltage signal and transmit the differential voltage signal to the equalizer.
The equalizer receives the differential voltage signal and the first control signal, performs a gain on the differential voltage signal based on the first control signal, and obtains a difference after the gain. The frequency response value of the differential voltage signal, which is configured to transmit the dynamic voltage signal to the I / O interface and the controller and is within the first bandwidth of the equalizer, is the band of the photoelectron detector. Any frequency within the first bandwidth that is greater than that within the width is higher than the high frequency cutoff frequency of the photoelectron detector.
The I / O interface is configured to output the differential voltage signal obtained after the gain.
The controller, based on the differential voltage signal obtained after the gain to generate the first control signal is composed of the first control signal to be sent to the equalizer, said first The control signal of is an optical receiver used to control the equalizer to perform gain on the differential voltage signal. In particular, the controller performs a plurality of sampling processes, and in each sampling process, the following process, that is,
Sending a control signal to the equalizer,
To obtain the value of the sampling point, sample the upper and lower levels of the received differential voltage signal, and modify the control signal based on a preset modification amount. Configured
After performing the plurality of sampling processes, the controller particularly transmits the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the plurality of sampling processes. The optical receiver according to claim 7, which is configured to be used as a control signal. In particular, the controller performs a plurality of detection processes, and in each detection process, the following process, that is,
Sending a control signal to the equalizer,
Using the first frequency as a boundary, the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency are detected separately in order to obtain an energy difference. Here, the first frequency is 0.28 / Tb, and Tb is the duration of each bit of the differential voltage signal, and the control signal is transmitted based on a preset correction amount. Implement the correction and
After performing the plurality of detection processes, the controller particularly uses the control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the plurality of detection processes as the first control signal. The optical receiver according to claim 7, which is configured to be used. A step of converting an optical signal received by an optoelectronic receiver by using an optoelectronic detector into a current signal, wherein the optoelectronic detector bandwidth is lower than the system transmission bandwidth requirement.
A step of performing a transimpedance gain on the current signal based on a first control signal by the optical receiver to obtain a voltage signal, wherein the transimpedance gain is within the first bandwidth. The frequency response value of the current signal is greater than that within the bandwidth of the photoelectron detector, and any frequency within the first bandwidth is greater than or equal to the high frequency cutoff frequency of the photoelectron detector. ,
By the light receiver, and generating a first control signal based on the voltage signal step into a differential voltage signal, and the differential voltage signal, said first control signal, A receiving method, including steps, used to control the optical receiver to perform a transimpedance gain on the current signal. Generating said first control signal based on the differential voltage signal, in particular,
By performing the sampling process a plurality of times and using the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the plurality of sampling processes as the first control signal. Therefore, in each sampling process, the following process, that is,
In order to obtain the voltage signal, transimpedance gain is performed on the current signal based on the control signal, and the voltage signal is converted into the differential voltage signal.
A claim that includes sampling the upper and lower levels of the differential voltage signal to obtain a sampling point value, and modifying the control signal based on a preset modification amount. Item 10. The method according to Item 10. Generating said first control signal based on the differential voltage signal, in particular,
The detection process is performed a plurality of times, and the control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the plurality of detection processes is used as the first control signal. , The following process in each detection process, ie
In order to obtain the voltage signal, transimpedance gain is performed on the current signal based on the control signal, and the voltage signal is converted into the differential voltage signal.
Using the first frequency as a boundary, the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency are detected separately in order to obtain an energy difference. Here, the first frequency is 0.28 / Tb, and Tb is the duration of each bit of the differential voltage signal, and the control signal is transmitted based on a preset correction amount. The method of claim 10, wherein the modification is carried out. After the step of converting the voltage signal into a differential voltage signal by the optical receiver, the method is a step of performing a gain on the differential voltage signal based on a second control signal. , The frequency response value of the differential voltage signal within the second bandwidth is greater than that within the first bandwidth, and any frequency within the second bandwidth is within the first bandwidth. Higher than any frequency of, including more steps,
After said step of generating said first control signal, said method comprising the step of generating the second control signal based on the differential voltage signal obtained after the gain, the second control 10. The method of claim 10, wherein the signal is used to control the optical receiver to perform gain on the differential voltage signal, further comprising a step. Generating said first control signal based on the differential voltage signal, in particular,
The first control controls the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the first sampling process a plurality of times and the first sampling process a plurality of times. It is to be used as a signal, and in each first sampling process, the following process, that is,
In order to obtain the voltage signal, transimpedance gain is performed on the current signal based on the control signal, and the voltage signal is converted into the differential voltage signal.
Including sampling the upper and lower levels of the differential voltage signal to obtain the value of the sampling point and modifying the control signal based on a preset modification amount.
Wherein said step of generating said second control signal based on the differential voltage signal, in particular,
The control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the second sampling process is performed a plurality of times and the second control is performed. It is to be used as a signal, and in each second sampling process, the following process, that is,
Gaining the differential voltage signal based on the control signal to obtain the differential voltage signal obtained after the gain.
To obtain the value of the sampling point, sampling the upper level and the lower level of the differential voltage signal obtained after the gain, and modifying the control signal based on the preset modification amount. 13. The method of claim 13, comprising the implementation of. Generating said first control signal based on the differential voltage signal, in particular,
The control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the first detection process is performed a plurality of times and the first detection process is performed a plurality of times is used as the first control signal. To use, in each first detection process, the following process, i.e.
In order to obtain the voltage signal, transimpedance gain is performed on the current signal based on the control signal, and the voltage signal is converted into the differential voltage signal.
Including sampling the upper and lower levels of the differential voltage signal to obtain the value of the sampling point and modifying the control signal based on a preset modification amount.
Wherein said step of generating said second control signal based on the differential voltage signal, in particular,
The control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the second detection process is performed a plurality of times and the second detection process is performed a plurality of times is used as the second control signal. To use, in each second detection process, the following process, i.e.
Gaining the differential voltage signal based on the control signal to obtain the differential voltage signal obtained after the gain.
Using the first frequency as a boundary, the energy of the differential voltage signal higher than the first frequency and the energy of the differential voltage signal lower than the first frequency are detected separately in order to obtain an energy difference. Here, the first frequency is 0.28 / Tb, and Tb is the duration of each bit of the differential voltage signal, and the control is based on the preset correction amount. 13. The method of claim 13, wherein modifying the signal is performed. A step of converting an optical signal received by an optoelectronic receiver by using an optoelectronic detector into a current signal, wherein the optoelectronic detector bandwidth is lower than the system transmission bandwidth requirement.
A step of performing a transimpedance gain on the current signal in order to obtain a voltage signal by the optical receiver, and a step of converting the voltage signal into a differential voltage signal.
A step of performing a gain on the differential voltage signal based on the first control signal by the optical receiver to obtain a differential voltage signal obtained after the gain, in performing the gain. The frequency response value of the differential voltage signal within the first bandwidth is greater than that within the bandwidth of the photoelectron detector, and any frequency within the first bandwidth is the height of the photoelectron detector. Steps and higher than the band cutoff frequency,
By the light receiver, and generating a first control signal based on the differential voltage signal obtained after the gain, the first control signal, to said differential voltage signal A receiving method, including steps, used to control the optical receiver to perform gain. The step of generating a first control signal based on the differential voltage signal obtained after the gain is particularly high.
By performing the sampling process a plurality of times and using the control signal corresponding to the sampling point having the maximum value among the plurality of sampling points obtained after the plurality of sampling processes as the first control signal. Therefore, in each sampling process, the following process, that is,
Gaining the differential voltage signal based on the control signal to obtain the differential voltage signal obtained after the gain.
In order to obtain the value of the sampling point, it is performed to sample the upper level and the lower level of the differential voltage signal obtained after the gain, and to modify the control signal based on a preset modification amount. 16. The method of claim 16, comprising being done. Wherein said step of generating said first control signal based on the differential voltage signal obtained after the gain is especially
The detection process is performed a plurality of times, and the control signal corresponding to the smallest energy difference among the plurality of energy differences obtained after the plurality of detection processes is used as the first control signal. , The following process in each detection process, ie
Gaining the differential voltage signal based on the control signal to obtain the differential voltage signal obtained after the gain.
The difference between the energy higher than the first frequency and the difference obtained after the gain, which is of the differential voltage signal obtained after the gain in order to use the first frequency as a boundary and obtain the energy difference. It is of a dynamic voltage signal and detects energies lower than the first frequency separately, where the first frequency is 0.28 / Tb and Tb is for each bit of the differential voltage signal. 16. The method of claim 16, comprising being a duration and performing modification of the control signal based on a preset amount of modification. A transimpedance amplifier circuit including a fixed resistor, a first transistor, a second transistor, a variable resistance circuit, and an output port.
The fixed resistor comprises two ports, one port is grounded and the other port is connected to the emitter of the first transistor.
The base of the first transistor is configured to receive an input signal, and the collector of the first transistor is connected to the emitter of the second transistor.
The base of the second transistor is configured to receive a bias voltage signal, the collector of the second transistor is connected to the first port of the variable resistance circuit, and the bias voltage signal is the input. Used to adjust the gain for the signal,
The output port is located on a connection line between the collector of the second transistor and the first port of the variable resistor circuit.
The variable resistance circuit includes three ports, a second port of the variable resistance circuit is configured to receive a control signal, a third port of the variable resistance circuit is grounded, and the control signal is a control signal. A transimpedance amplifier circuit used to control the resistance value of the variable resistance circuit.

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